A boiler flue gas waste heat recovery system for a thermal power plant

Abstract

The application discloses a boiler flue gas exhaust heat recovery system for a thermal power plant, which comprises an outer cylinder shell, sealing rings fixed at two ends of the outer cylinder shell respectively, and a left sealing ring communicated with an inlet flue pipe and a right sealing ring communicated with an exhaust pipe; a control end seat used for sealing assembly with the sealing rings, which comprises a hole plate used for placing fixation, a fixed disc fixed on the hole plate, a plurality of assembly holes four circumferentially distributed on the fixed disc, a sealing disc ring fixed on an inner disc side of the fixed disc, assembly holes two on the sealing disc ring corresponding to the assembly holes four, a water blocking sealing paste ring rotatably connected to the inner disc side of the sealing disc ring, assembly holes one on the water blocking sealing paste ring corresponding to the assembly holes two, and heat exchange water pipes communicated between corresponding assembly holes one on the left and right sides, wherein a group of corresponding assembly holes four on the left and right sides are respectively communicated with blowdown pipes; and a control system installed on the control end seat and used for switching the heat exchange water pipes communicated with the blowdown pipes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler flue gas waste heat recovery, in particular to a flue gas waste heat recovery system for a power plant boiler. BACKGROUND

[0002] During the boiler combustion process, a large amount of flue gas with certain heat is generated, which is directly discharged into the air, not only affecting the environment, but also wasting a large amount of waste heat. Therefore, the discharged flue gas is generally subjected to waste heat recovery treatment. However, in the existing device for flue gas waste heat recovery, in the water liquid recovery flue gas waste heat recovery mode, the inner wall of the water pipe is prone to residual dirt accumulation and difficult to clean up, in addition, the cleaning process is time-consuming and laborious, low in efficiency, and also affects the normal recovery of flue gas waste heat.

[0003] Therefore, the person skilled in the art provides a flue gas waste heat recovery system for a power plant boiler to solve the problems raised in the background. SUMMARY

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a flue gas waste heat recovery system for a power plant boiler, comprising:

[0005] An outer cylinder shell, both ends of which are fixed with sealing rings, and the left sealing ring is communicated with the flue gas inlet pipe and the right sealing ring is communicated with the flue gas outlet pipe;

[0006] A control end seat for sealing assembly with the sealing ring, comprising a hole plate for placing fixation, a fixed disc fixed on the hole plate, a plurality of circumferentially distributed assembly holes four provided on the fixed disc, a sealing disc ring fixed on the inner disc side of the fixed disc, a plurality of assembly holes two corresponding to the assembly holes four provided on the sealing disc ring, a water blocking sealing ring fixedly connected to the inner disc side of the sealing disc ring, a plurality of assembly holes one corresponding to the assembly holes two provided on the water blocking sealing ring, and a heat exchange water pipe communicated between the left and right assembly holes one, wherein a group of left and right assembly holes four are respectively communicated with the blowdown pipe;

[0007] A control system installed on the control end seat for switching the heat exchange water pipe communicated with the blowdown pipe.

[0008] Preferably, the control system comprises:

[0009] A shaft cylinder, both ends of which are rotatably connected to the assembly holes three on the left and right sides, and an outer cylinder wall of which is fixedly sleeved with a drainage vane one, an outer spiral of which is close to the inner wall of the outer cylinder shell, and the heat exchange water pipe is arranged through the drainage vane one;

[0010] A control motor is arranged on one side of the control end seat, and an output end of the control motor is fixedly connected to one end of the shaft cylinder.

[0011] Preferably, the assembly hole four is fixed with a ring frame two, a rotatable rotating drum is installed on the ring frame two, a fixed gear ring one is fixed on the end side of the rotating drum, and a drainage fan blade that rotates synchronously with the rotating drum is installed in the rotating drum in the left assembly hole four of the remaining multiple left-right corresponding assembly hole fours, a rotatable drainage fan blade is installed on the shaft part of the ring frame two, and a rotatable gear ring two is installed on one side of the assembly hole three, and the gear ring two is connected with the gear ring one.

[0012] Preferably, the two ends of the heat exchange water pipe are fixed with a ring frame one, a strong magnet one is rotatably installed on the shaft part of the ring frame one, a shaft rod is fixedly connected between the two strong magnets one, a drainage thread two is fixedly sleeved on the outside of the shaft rod, the outer spiral of the drainage thread two is frictionally connected with the inner tube wall of the heat exchange water pipe, and a strong magnet two that is used for abutting and magnetically attracting the strong magnet one is installed on the shaft part of the drainage fan blade in one of the multiple left-right corresponding assembly hole fours.

[0013] Preferably, the outer spiral of the drainage thread two is cut to form dense brush strips.

[0014] Preferably, the shaft part of the drainage fan blade in the left assembly hole four of the remaining multiple left-right corresponding assembly hole fours is provided with a stop column head that is used for abutting the strong magnet one.

[0015] Preferably, the remaining multiple left-right corresponding assembly hole fours are respectively communicated with a flow collecting box, the left flow collecting box is communicated with a drain pipe, and the right flow collecting box is communicated with a water inlet pipe.

[0016] Compared with the prior art, the present application provides a thermal power plant boiler flue gas exhaust heat recovery system, which has the following beneficial effects:

[0017] In the present application, by starting the regulation system regularly, the heat exchange water pipe can be sequentially switched to be communicated with the blowdown pipe, so that the tube wall of the heat exchange water pipe can be cleaned and replaced, and the work efficiency is higher and the operation is more convenient and flexible; the water flow drives the drainage fan blade, and the drainage fan blade can limit the water flow, so as to facilitate the uniformity of the water flow in the multiple heat exchange water pipes, thereby ensuring the uniformity of the heat exchange between the water flow and the flue gas exhaust heat, and enhancing the stable and uniform distribution effect of the water flow heat; the outer spiral brush strip of the drainage thread two rubs and brushes the tube wall of the heat exchange water pipe, so as to clean the inner tube wall of the heat exchange water pipe and discharge the cleaning dirt, thereby ensuring the high efficiency of the flue gas exhaust heat recovery. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the flue gas exhaust heat recovery system of the present application.

[0019] Figure 2The schematic diagram of the local structure of the control end seat of the application is shown in the figure;

[0020] Figure 3 The schematic diagram of the local section structure of the exhaust smoke waste heat recovery system structure of the application is shown in the figure Figure 1 ;

[0021] Figure 4 The schematic diagram of the local section structure of the exhaust smoke waste heat recovery system structure of the application is shown in the figure Figure 2 ;

[0022] Figure 5 The schematic diagram of the internal structure of the heat exchange water pipe of the application is shown in the figure;

[0023] Figure 6 The schematic diagram of the brush strip structure of the application is shown in the figure;

[0024] In the figure: 1, shaft cylinder; 2, smoke inlet pipe; 3, flow guide vane one; 4, heat exchange water pipe; 5, outer cylinder shell; 6, control end seat; 7, smoke exhaust pipe; 8, flow collection box; 9, drain pipe; 10, water inlet pipe; 11, control motor; 12, blowdown pipe; 13, sealing ring; 41, flow guide vane two; 42, shaft rod; 43, ring frame one; 44, strong magnet one; 45, water blocking sealing ring; 411, brush strip; 451, assembly hole one; 61, hole plate; 62, fixed disc; 63, gear ring one; 64, rotating cylinder; 65, gear ring two; 66, flow guide fan blade; 67, blocking column head; 68, sealing disc ring; 69, assembly hole two; 610, strong magnet two; 621, assembly hole three; 622, assembly hole four; 623, ring frame two. DETAILED DESCRIPTION

[0025] Referring Figures 1-6 , the application provides a technical solution: a thermal power plant boiler exhaust smoke waste heat recovery system, which comprises:

[0026] The outer cylinder shell 5 is fixed with sealing rings 13 at both ends, and the left sealing ring 13 is communicated with the smoke inlet pipe 2, and the right sealing ring 13 is communicated with the smoke exhaust pipe 7;

[0027] The control end seat 6 is used for sealing assembly with the sealing ring 13, which comprises a hole plate 61 for placing fixation, the hole plate 61 is fixed with a fixed disc 62, the fixed disc 62 is provided with a plurality of assembly hole fours 622 distributed in the circumferential direction, the inner disc side of the fixed disc 62 is fixed with a sealing disc ring 68, the sealing disc ring 68 is provided with assembly hole twos 69 corresponding to the assembly hole fours 622, the inner disc side of the sealing disc ring 68 is further rotationally connected with a water blocking sealing ring 45, the water blocking sealing ring 45 is provided with assembly hole ones 451 corresponding to the assembly hole twos 69, the left and right corresponding assembly hole ones 451 are communicated with the heat exchange water pipe 4, and one group of left and right corresponding assembly hole fours 622 are respectively communicated with the blowdown pipe 12;

[0028] A control system is installed on the control end seat 6 to control the communication between the heat exchange water pipe 4 and the blowdown pipe 12.

[0029] In this embodiment, the right end side of the heat exchange water pipe is the water inlet end side, and the left end side of the heat exchange water pipe is the water outlet end side, which is beneficial to fully absorb the waste heat in the recovered flue gas. In long-term operation, dirt is easily accumulated on the pipe wall of the heat exchange water pipe. Therefore, the heat exchange water pipe can be sequentially switched to be in communication with the blowdown pipe by regularly starting the control system, so as to clean and replace the pipe wall of the heat exchange water pipe. For the replacement process of the heat exchange water pipe, it should be noted that the plugging state of the two ends of the heat exchange water pipe and the plugging state of the assembly hole four in the replacement alternation process need to be paid attention to. In addition, the cleaning and replacement of the heat exchange water pipe can also be carried out without stopping, that is, the recovery of flue gas waste heat can be continuously carried out in real time, so as to make the work efficiency higher and the operation more convenient and flexible.

[0030] In this embodiment, the control system comprises:

[0031] The shaft cylinder 1 is rotatably connected to the assembly hole three 621 on the left and right sides at both ends, and the outer cylinder wall is fixedly sleeved with the drainage vane one 3. The outer spiral of the drainage vane one 3 is close to the inner wall of the outer cylinder shell 5, and the heat exchange water pipe 4 penetrates the drainage vane one 3.

[0032] The control motor 11 is arranged on one side of the control end seat 6, and the output end is fixedly connected to one end of the shaft cylinder 1.

[0033] Therefore, the shaft cylinder outer wall, the outer cylinder shell inner wall and the drainage vane one can form a spiral flue gas cavity for guiding the flue gas, so that the heat of the flue gas can be fully exchanged with the heat exchange water pipe, and the heat exchange efficiency is improved. A small gap is reserved between the outer spiral of the drainage vane one and the inner wall of the outer cylinder shell, which can avoid affecting the spiral flow of the flue gas and avoid large friction between the drainage vane one and the inner wall of the outer cylinder shell. Specifically, the shaft cylinder, the drainage vane and the sealing disc ring are driven to rotate by the control motor, and the heat exchange water pipe rotates circumferentially. It should be noted that after the rotation assembly hole two at one end of the heat exchange water pipe is completely dislocated from the corresponding assembly hole four, the communication state with the corresponding next assembly hole four appears, so as to avoid the situation that one assembly hole two is in communication with two rotation assembly holes four.

[0034] In this embodiment, a ring frame 623 is fixed in the assembly hole 4 622, and a rotatable rotating cylinder 64 is installed on the ring frame 623. A toothed ring 63 is fixed on the inner cylinder end side of the rotating cylinder 64, and a flow guide fan 66 that rotates synchronously with the rotating cylinder 64 in the left side of the remaining multiple sets of left and right corresponding assembly holes 4 622 is fixed in the assembly hole 4. A rotatable flow guide fan 66 is installed on the shaft of the ring frame 2 623, and a rotatable toothed ring 65 is installed on one side of the assembly hole 3 621. The toothed ring 65 is meshed with the toothed ring 63.

[0035] In this embodiment, the water flow impacts the guide fan blades, causing the second toothed ring to rotate and drive the first toothed ring to rotate. The structure in which multiple second toothed rings mesh with the first toothed ring helps to ensure the synchronization of the rotation speeds of the multiple second toothed rings. Therefore, the water flow impacts and drives the guide fan blades, which in turn restrict the water flow, thereby helping to ensure the uniformity of the water flow in multiple hot water exchange pipes. This, in turn, ensures the uniformity of heat exchange between the water flow and the waste heat of the flue gas, and enhances the stable and uniform distribution of heat in the water flow.

[0036] In this embodiment, ring frames 43 are fixed at both ends of the hot water pipe 4. A strong magnet 44 is rotatably mounted on the shaft of the ring frame 43. A shaft 42 is fixedly connected between the two strong magnets 44. A drainage thread 41 is fixedly sleeved on the outside of the shaft 42. The outer thread of the drainage thread 41 is in frictional connection with the inner wall of the hot water pipe 4. A strong magnet 610 is installed on the shaft of the drainage fan blade 66 located in one of the sets of left and right corresponding assembly holes 622, which is used to dock with the strong magnet 44 and is magnetically attracted to it. The outer spiral ring of the second drain thread 41 is cut to form dense brush strips 411. Specifically, when the control system controls a set of hot water exchange pipes to be connected to the corresponding sewage pipe, the first strong magnet will attract the second strong magnet. At this time, when the first toothed ring drives the second toothed ring located at one end of the sewage pipe to rotate, it will also drive the shaft to rotate, thereby driving the second drain screw to rotate. The outer spiral ring of the second drain screw rubs and cleans the pipe wall of the hot water exchange pipe, thus achieving the effect of cleaning the inner wall of the hot water exchange pipe and removing clean dirt.

[0037] In this embodiment, the shaft of the guide fan blade 66 in the left assembly hole 4 of the remaining multiple sets of left and right corresponding assembly holes 622 is equipped with a baffle head 67 for docking and fitting with the strong magnet 44. That is to say, when the strong magnet 44 is not aligned with the strong magnet 2, the strong magnet 44 will dock with the baffle head to ensure the cleanliness of the end of the strong magnet 44.

[0038] In this embodiment, the remaining multiple sets of corresponding left and right assembly holes 622 are connected to the heat exchange box 8, the left heat exchange box 8 is connected to the drain pipe 9, and the right heat exchange box 8 is connected to the water inlet pipe 10, thereby improving the heat exchange effect.

[0039] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacements or changes within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A flue gas waste heat recovery system for a boiler of a thermal power plant, characterized in that, It includes: The outer shell (5) is fixed with a sealing ring (13) at both ends, and the left sealing ring (13) is communicated with the smoke pipe (2), and the right sealing ring (13) is communicated with the smoke exhaust pipe (7); The control end seat (6) is used for sealing assembly with the sealing ring (13), which includes a hole plate (61) for placing fixation, a fixed disc (62) is fixed on the hole plate (61), a plurality of circumferentially distributed assembly holes four (622) are arranged on the fixed disc (62), a sealing disc ring (68) is fixed on the inner disc side of the fixed disc (62), a plurality of assembly holes two (69) corresponding to the assembly holes four (622) are arranged on the sealing disc ring (68), and a water blocking sealing paste ring (45) is rotatably connected to the inner disc side of the sealing disc ring (68). The water blocking sealing paste ring (45) is provided with assembly hole one (451) corresponding to assembly hole two (69), and the left and right corresponding assembly hole one (451) is communicated with heat exchange water pipe (4), and one group of left and right corresponding assembly hole four (622) is communicated with sewage pipe (12) respectively; The control system is installed on the control end seat (6), which is used for exchanging the heat exchange water pipe (4) communicated with the sewage pipe (12); The control system includes: The shaft cylinder (1) is rotatably connected at both ends to the assembly hole three (621) located on the left and right sides, the outer cylinder wall is fixedly sleeved with the drainage screw blade one (3), the outer spiral of the drainage screw blade one (3) is close to the inner wall of the outer cylinder shell (5) on one side, and the heat exchange water pipe (4) penetrates the drainage screw blade one (3) and is arranged; The control motor (11) is arranged on one side of the control end seat (6), and one end of the output shaft is fixedly connected with the shaft cylinder (1); The assembly hole four (622) is fixed with a ring frame two (623), the rotatable rotating cylinder (64) is installed on the ring frame two (623), the inner cylinder end side of the rotating cylinder (64) is fixed with a gear ring one (63), and the rotating cylinder (64) in the left assembly hole four of the remaining plurality of left and right corresponding assembly hole four (622) is installed with a drainage fan blade (66) rotating synchronously with it, the ring frame two (623) is installed with a rotatable drainage fan blade (66), and the assembly hole three (621) is installed with a rotatable gear ring two (65) on one side. The gear ring two (65) is meshed and connected with the gear ring one (63); The two ends of the heat exchange water pipe (4) are fixed with a ring frame one (43), the shaft part of the ring frame one (43) is rotatably installed with a strong magnet one (44), the two ends of the strong magnet one (44) are fixedly connected with a shaft rod (42), the outer part of the shaft rod (42) is fixedly sleeved with a drainage screw thread two (41), the outer spiral of the drainage screw thread two (41) is frictionally connected with the inner tube wall of the heat exchange water pipe (4), and the shaft part of the drainage fan blade (66) located in one of the left and right corresponding assembly hole four (622) is installed with a strong magnet two (610) for abutting with the strong magnet one (44) and magnetically attracted; The remaining plurality of left and right corresponding assembly hole four (622) is respectively communicated with the flow collecting box (8), the left flow collecting box (8) is communicated with the drain pipe (9), and the right flow collecting box (8) is communicated with the water inlet pipe (10).

2. A system for recovering exhaust heat from flue gas of a boiler of a thermal power plant according to claim 1, characterized in that, The outer thread turns of the drainage thread two (41) are cut to form dense brush strips (411).

3. The system for recovering exhaust gas heat of a boiler in a thermal power plant according to claim 1, characterized in that, The drainage fan blade (66) shaft part in the left assembly hole four among the corresponding assembly hole fours (622) in the remaining groups is provided with a blocking column head (67) for abutting with the strong magnet one (44).

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